Nortec Steam Humidifiers - Manual (Page 11)

valves operation. Green and yellow lights flash during
this time.
If there is no call for humidity, the humidifier is
standing by and green light flashes. When control loop
is closed, the green light is steady on and the
humidifier starts its operation. The controller waits 10
seconds before energizing the on-board relays. When
the relays energize, heating voltage is delivered to the
cylinder. After a 30 second delay, the fill valve is
activated (if the output from the cylinder is below 100
%). If controller detects increase of amperage above
allowed range, the unit will activate drain valve for 2
seconds.
During operation, the controller measures the rate
at which water is converted to steam and thus the
mineral content of water inside the cylinder. When this
rate exceeds the design optimum, a drain of the
cylinder takes place. The amount of water drained is
just enough to keep the contained water at design
levels.
During start up, when mineral content in the water
is low, water will reach the top of the cylinder at which
point the yellow indicator light will come on. This is
normal operation with a fresh cylinder. After a period of
time the water level will drop and the yellow light will
turn off.
High water level in the cylinder also indicates that
the cylinder is near the end of its service life as
electrodes become coated with minerals. The yellow
light coming on more often would be the first indication
of approaching the end of the cylinder life.
A flashing yellow light indicates a fault of the
humidifier and the controller shuts off the humidifier.
Please refer to troubleshooting section.
For periods of time with no call for humidity, longer
than 2 days, the humidifier automatically drains water
from cylinder.
MANUAL CAPACITY ADJUSTMENT
The RESDELUX humidifier is rated in lbs/hr of
steam output capacity. Set to 100%, it will operate at
full output until the humidistat has sensed that the
humidity has reached setpoint, it will then stop when
the control circuit 1-2 is interrupted. See Figure #13.
If the humidifier is oversized, the humidistat will be
quickly satisfied (less then 10 minutes) and stop the
humidifier. As the humidity level drops the humidistat
starts the humidifier again. It is quickly satisfied and
stops again. The resultant short-cycling can be easily
overcome. A manual capacity adjustment
potentiometer is provided on the RESDELUX main PC
board to increase the runtime to about 15 minutes. It
is marked “CAPACITY ADJUSTMENT” and is
adjustable from 25 to 100% of operating rating.
OTHER POTENTIOMETERS
Do not adjust any other potentiometers on the PC
board. They are factory-set and not to be adjusted in
the field.
MAINTENANCE
As with all automatic and mechanical devices,
humidifiers require periodic maintenance and
servicingeither by the user or competent service
personnel to provide continued customer
satisfaction, longer equipment life and reduction in
customer cost.
WARNING! DISCONNECT THE UNIT FROM
THE POWER SUPPLY BEFORE SERVICING.
The plumbing and electrical compartments contain
high voltage components and wiring. The access door
is equipped with a lock. Access should be limited to
authorized personnel only.
Note: Review periodic maintenance. Checklist on page
16.
STEAM CYLINDER
WHEN TO REPLACE THE STEAM CYLINDER
After a period of operation (not on initial startup),
the water level will approach the top of the cylinder.
- 8 -
CONDENSATE RETURN
(OPTIONAL)
1” AIR
GAP
FILL
CUP
1. INLET CHAMBER
3. WATER OVERFLOW
CHAMBER (SAFETY DRAIN
IN CASE OF FILL VALVE/
CONTROL BOARD FAILURE)
STRAINER FILL
VALVE
TAP WATER
SUPPLY
DRAIN
CONNECTION
DRAIN
PAN
DRAIN CANAL
(OPEN TO ATMOSPHERE)
DRAIN
VALVE
CYLINDER
1 2 3
2. FILL CHAMBER
STEAM HOSE
ELECTRODES
Figure #15
Operation Schematic